Ni/YSZ electrode degradation studied by impedance spectroscopy — Effect of p(H2O)

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Anode supported solid oxide fuel cells have been tested and the degradation over time was monitored and analyzed by impedance spectroscopy. Reproducibility of initial cathode, anode and electrolyte performance was obtained. Anode (Ni/YSZ) degradation was analyzed for tests applying p(H2O) of 0.2 atm, 0.4 atm and 0.6 atm at 750 °C and 0.75 A/cm2. The anode degradation could be well described by the equation: RNi,TPB(t) = RNi,0 + ΔR∙(1 − exp(− t / τ)). The initial resistance and total increase for the Ni–YSZ charge transfer resistance, RNi,0 and ΔR, were similar for all tests (i.e. not directly correlated with p(H2O)), but the characteristic time, τ, for the anode degradation was significantly higher for the test at p(H2O) = 0.2 atm than at p(H2O) of 0.4 atm and 0.6 atm.
Original languageEnglish
JournalSolid State Ionics
Publication date2011
Volume192
Issue1
Pages547-551
ISSN0167-2738
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 11

Keywords

  • Solid Oxide Fuel Cells, Fuel Cells and hydrogen
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